Post-treatment method of fluorescent powder for lamp

A fluorescent powder and ammonium fluoride technology, applied in the field of light sources, can solve the problems of loose and non-dense film, poor transparency of fluorescent powder, and affecting the external quantum efficiency of white light LED devices, so as to improve the light extraction rate, improve the external quantum efficiency, Consumption saving effect

Inactive Publication Date: 2012-11-07
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the irregular edges and corners will lead to the preparation of the phosphor film layer, the film layer is loose and not dense, a thicker film layer is required, and the light scattering rate of the phosphor powder is also higher, resulting in poor transparency of the phosphor powder, which affects the white LED device. external quantum efficiency
Chinese patent CN101126019 discloses a post-treatment method for fluorescent powder used in light-emitting diodes. After cleaning with hydrofluoric acid, high-temperature solid-state reaction is performed to make the fluorescent powder agglomerate again. It needs to be ground, pulverized and screened again to obtain micron-scale powder. Body particles, the phosphor powder obtained in the grinding and pulverizing process must have an irregular shape with edges and corners, so it has no modification effect on the phosphor powder shape
In addition, the post-processing methods of other existing fluorescent powders often need to be carried out at high temperature. For example, Chinese patent CN1510102 discloses a kind of coated fluorescent powder and its preparation method, which needs to be baked at 450 to 600 degrees Celsius to form a film.

Method used

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  • Post-treatment method of fluorescent powder for lamp
  • Post-treatment method of fluorescent powder for lamp
  • Post-treatment method of fluorescent powder for lamp

Examples

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Effect test

Embodiment 1

[0026] The phosphor used in this embodiment is a phosphor for white LEDs, and its composition is Y 3 Al 5 O 12 :Ce 3+ , which were prepared by a high-temperature solid-phase method. The mixed solution of the present embodiment adopts ammonium fluoride and nitric acid to mix, and the specific implementation steps are as follows:

[0027] Step 1: Put 10mg of YAG phosphor into a plastic bottle, then pour 50mL of 40% mass concentration of ammonium fluoride and nitric acid mixture into the bottle, and shake well.

[0028] Step 2: Put the plastic bottle in an ultrasonic water bath and set the water temperature to keep at 90 degrees Celsius.

[0029] Step 3: After 6 hours, take out the plastic bottle, pour out the acid solution after the phosphor is precipitated, and leave the treated phosphor, then pour it into deionized water and then put it into an ultrasonic water bath for cleaning, after about 5 minutes, put the Take out the ultrasonic water bath from the plastic bottle, an...

Embodiment 2

[0033] The phosphor used in this embodiment is a phosphor for white LEDs, and its composition is Y 3 Al 5 O 12 :Ce 3+ , which were prepared by a high-temperature solid-phase method. The mixed solution of the present embodiment adopts ammonium fluoride and phosphoric acid to mix, and the specific implementation steps are as follows:

[0034] Step 1: Put 10mg YAG phosphor into a plastic bottle, then pour 50mL of 50% mass concentration of ammonium fluoride and phosphoric acid mixture into the bottle, and shake well.

[0035] Step 2: Put the plastic bottle in an ultrasonic water bath and set the water temperature to keep at 80 degrees Celsius.

[0036] Step 3: After 5 hours, take out the plastic bottle, pour out the acid solution after the phosphor is precipitated, and leave the treated phosphor, then pour it into deionized water and then put it into an ultrasonic water bath for cleaning, after about 5 minutes Take out the ultrasonic water bath from the plastic bottle, and po...

Embodiment 3

[0040]The phosphor powder used in this embodiment is the phosphor powder for white light LED, and its composition is Y 3 Al 5 o 12 : Ce 3+ , was prepared by a high-temperature solid-phase method. The mixed solution of the present embodiment adopts ammonium fluoride and glacial acetic acid to mix, and concrete implementation steps are as follows:

[0041] Step 1: Put 10mg of YAG phosphor into a plastic bottle, then pour 50mL of a mixture of 70% mass concentration ammonium fluoride and glacial acetic acid into the bottle, and shake well.

[0042] Step 2: Put the plastic bottle into an ultrasonic water bath, and set the water temperature at 80 degrees Celsius.

[0043] Step 3: After 5 hours, take out the plastic bottle, pour out the acid solution after the phosphor powder is precipitated, and then pour deionized water into the ultrasonic water bath for cleaning. Take the plastic bottle out of the ultrasonic water bath, and pour out the deionized water after the phosphor powd...

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Abstract

The invention belongs to the technical field of a light source and particularly relates to a post-treatment method of fluorescent powder for a lamp. According to the post-treatment method disclosed by the invention, reactive etching is carried out on the surface of the fluorescent powder by utilizing a mixed solution of ammonium fluoride and other acids so as to fully etch surface defects and passivate the surface. The post-treatment method comprises the specific steps of: etching a fluorescent powder surface by the mixed solution of the ammonium fluoride and the other acids, and filtering and separating out the fluorescent powder from the mixed solution; then respectively washing by de-ionized water and alcohol; and finally, drying and dispersing. The fluorescent powder processed by the post-treatment method disclosed by the invention has good dispersity and transparency. The fluorescent powder is used for preparing a white-light LED (Light Emitting Diode); with the adoption of the fluorescent powder, the back scattering rate can be reduced, and the light removing rate is improved, namely the external quantum efficiency of a device is improved; and the use amount of the fluorescent powder can be saved.

Description

technical field [0001] The invention belongs to the technical field of light sources, and in particular relates to a post-processing method of fluorescent powder for lamps. Background technique [0002] Most of the current commercial electric light sources need to use phosphors for light conversion. Fluorescent lamps need to use three-primary phosphors to convert ultraviolet light into a certain proportion of red, green, and blue mixed white light, while white LEDs mainly use phosphors to convert blue light. The blue light or ultraviolet light generated by LED or ultraviolet UV-LED is converted into double complementary color or three primary color mixed white light respectively, and the technology of multi-chip white light LED is not yet mature. [0003] It can be seen that, whether it is a gas discharge fluorescent lamp or a solid-state white light LED device, phosphors are an essential key material. At present, commercial phosphors are prepared by a high-temperature soli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80C09K11/00
CPCY02B20/181Y02B20/00
Inventor 何志江区琼荣梁荣庆
Owner FUDAN UNIV
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